Machine for erecting double side walls on double walled cartons



Feb. 16, D HL MACHINE FOR ERECTING DOUBLE SIDE WALLS ON DOUBLE WALLEDCARTONS Filed Dec. 3, 1952 3 Sheets-Sheer. l

w y a f M 47' 5 IN VEN TOR Feb. 16, 1954 v J. D. BEHL 2,669,167

MACHINE FOR ERECTING DOUBLE SIDE WALLS ON DOUBLE WALLED CARTONS FiledDec. 3, 1952 3 Sheets-Sheet 2 Ti -.Z.Z. Y 7- 7 f @mgw Feb. 16, 1954 JBEH'L 2,669,167

MACHINE FOR ERECTING DOUBLE SIDE WALLS ON DOUBLE WALLED CARTONS FiledDec. 3, 1952 3 Sheets-Sheet. I5

INVENTOR.

CM 2 56m i,@wa {We -5 in Fi 1.

-I-l-'--II in Fig. 1.

Patented Feb. 16, 1954 MACHINE FOR ERECTING DOUBLE SIDE WALLS ON DOUBLEWALLED CARTONS John D. Behl, Kalamazoo, Mich., assignor to SutherlandPaper Company, Kalamazoo, Mich., a corporation of Michigan ApplicationDecember 3, 1952, Serial No. 323,816

16 Claims.

This invention relates to improvements in machine for erecting doubleside walls on double walled cartons.

The principal objects of this invention are:

First, to provide a machine which will automatically form extended sideflaps on a carton blank into double side walls and lockingly engage theside walls with previously erected double end walls.

Second, to provide a machine that will fold the side wall forming flapsof a carton blank in the desired fashion without unnecessarily rubbingand marring the Wall forming flaps.

Third, to provide a machine which will fold a flap in three spacedparallel fold lines and progressively fold the flap into a double walledstructure.

Other objects and advantages of the invention will be apparent from aconsideration of the following description and claims. The drawings ofwhich there are three sheets illustrate a highly practical form of theinvention.

Fig. 1 is a plan view of the machine as attached to an auxiliarystructure for delivering the partially erected cartons thereto.

Fig. 2 is a perspective view of one of the partially erected cartons asit is delivered to the side wall folding machine.

Fig. 3 is a perspective View of the finished double walled carton asdelivered by the machine.

Fig. 4 is a fragmentary transverse cross sectional view through themachine taken along the plane of the line 4-4 in Fig. 1.

Fig. 5 is a fragmentary transverse cross tional view taken along theplane of the secline secline secline seeline .8- -8 in Fi 1.

secline Fig. 9 is a fragmentary transverse cross tional view taken alongthe plane of the 99 in Fig. 1.

Fig. 10 is a fragmentary transverse cross tional view taken along theplane of, the Ill-10 in Fig. 1.

Fig. 11 is a fragmentary transverse cross tional view taken along theplane of the secline secline Fig. 12 is a fragmentary longitudinal crosssectional view taken along the plane of the line lZ-IZ in Fig. 1.

Fig. 13 is a fragmentary perspective view illustrating the side wallforming flap in the initial bending stages thereof.

Fig. 14 is a fragmentary perspective view of the carton with the sidewall forming flap in a further folded position.

Fig. 15 is a fragmentary perspective View of the carton near the end ofthe erecting operation.

Fig. 16 is a fragmentary perspective view of the carton in its finallyerected position.

The carton on which the machine is designed to operate is made of paperboard or cardboard and includes a flat rectangular bottom panel I havingouter end walls 2 folded upwardly from the ends thereof. The top edgesof the end walls are turned inwardly in top end spacer walls 3 and theinner edges of the top end spacer walls are connected to downwardlyextending inner end walls4 that are thus positioned in parallel spacedrelationship with the outer end walls 2. The lower edges of the innerend walls 4 are connected to integral attaching flaps 5 that are gluedto the bottom panel I. The end walls 2 and 4 are erected into therectangular cross sectional shape illustrated by a preliminary formingand erecting structure a portion of which is indicated at 6 in Fig. 1.The relative description of the sides and ends of the carton is forpurpose of description only and it will be appreciated that either sideof the carton might be considered the side or end. The cartons aredelivered to the side wall erecting apparatus from the end wall erectingmechanism by a conveyor generally indicated at I with the end walls 2and 4 at the leading and trailing ends of the partially erected cartonwith respect to the path of movement of the carton.

The ends of the inner side walls 4 are cut away or notched as at 8 toprovide a flap receiving recess in the chambered end wall of the cartonand the notch 8 is enlarged at the bottom to provide a downwardly facinglocking shoulder 9.

The side wall forming flaps of the carton blank are folded integrallyupwardly from the side edges of the bottom panel I as at H]. The sidewall forming flaps are prescored as at I l to form a fold line betweenthe outer side wall panel [2 and a top spacer panel [3. A second scoreline i l defines a folded connection between the top spacer panel l3 andthe inner side wall panel 15. A third score line l6 forms a foldedconnection between the inner side wall panel l and a bottom spacer flapll. The ends of the inner side wall panel are cut away from the of thetop spacer panel l2 by a distance approximately equal to the width 01the top spacer panel 3 in the double end walls. The end of the innerside wall panel is notched as. at it to provide an upwardly facingshoulder that coacts with the locking shoulder a on the inner end wallwhen all of the walls are erected. The triangular portion It on the endsof the inner side walls forms a locking tab that is projected. throughthe notched end 8 of the inner end wall and desirably the line ofconnection between the tab is and the inner side wall panel isscored asat 26 to facilitate entry of the locking tabs between the inner endwalls of thecarton.

The outer side wall panels ii are provided with flap receiving slots 2|and the outer" end wall panels 2 are provided with end flaps 22 that arefolded into locking engagement in the slots by the preforming mechanism5.. The cartons thus come from the preforming mechanism G in the formillustrated in Fig. 2..

The conveyor 5 which advances: the partially formed cartons through thefinal erecting operation includes a conveyor chain 23 driven in timedrelationship with. the preforming mechanism by the shaft 24 and chain25. The conveyor chain 23 is provided with carton advancing flights 26that advance the cartons progressively along the conveyor way El. Siderails 28 laterally support the side walls of the carton with the upperportions of the side wall forming flap projecting above the level of theside rails. Extending transversely across and over the conveyor way andthe containers thereon is a bridge element 2% located near the infeedend of the conveyor. A second bridge element- 38 extends transverselyacross the conveyor way near the off-deed end of the conveyor. A centralhold down rail 5! is supported by the bridge elements longitudinallyover the center of the conveyor way and above the cartons to slidinglyengage the erected end walls of the cartons as they are advanced alongthe way.

The first folding operation performed by the machine is the folding ofthe bottom spacer flap ill from the plane of the side flap formingpanel. This operation is performed as is best illustrated in Fig. l bypairs of rollers 32 and 33 supported from the bridge element 29 androtatable about transversely spaced vertical axes. The rollers 32 aredisposed to engage the inner sides of the side wall forming flaps justbelow the score line it while the rollers 33 are disposed to engage theouter side of the side wall forming flap above the score line. As thecarton is advanced between the pairs of rollers 32 and 33 the score lineIt is broken or bent to deflect the bottom spacer panel I! inwardly ofthe carton and of the conveyor way. During the breaking of the scoreline it the side wall forming flaps are held upwardly by a support 34that is carried underneath the bridge element 29 and the center rail 3!.The side edges of the support 34 are disposed in inwardly spacedrelationship with respect to the side rails 28 and hold the side wallforming flaps in upright position.

fter the bottom spacer flaps have been bent from the plane of the innerside wall panels i5 the container is advanced. to side flap foldingrolls best illustrated in Fig. 5 and indicated at The rollers 35- aresupported on vertical axes spaced outwardly from. the general plane-oithe side rails 28 and the rollers are downwardly tapered as illustratedto engage the outer sides of the inner side wall flaps i5 and bend theinner side walls inwardly of the carton. The side edges of the support34 continue to laterally support the inner surface of the side wallforming flap'just below the score linev is between the inner side wallpanel and the upper side wall spacer panel 52. After passing the rollersi the inner side wall panels are advanced past side flap folding.rollers 36 that are rotatable about upwardly and inwardly inclined axesso that the periphery of the rollers engages the partially deflectedinner; side. wall panels and bends them further inwardly. The rollers 35are inwardly tapered to facilitate entry of the leading edges of the.inner side. wall panels to below the periphery of the rollers 36. Afterpassing the side flap folding rollers 35 the cartons are advanced pastbending rollers 37 that are rotatable about transverse horizontal axes.and are disposed with their peripheries located over and inwardly ofextensions 38 of the support 34. The rollers 31 thus coact with the.support extensions 38 t0 crimp the fold along the score line I4.

After passing the bending rollers 31 the cartons are advanced to alongitudinally spaced series of rollers 39A, 39B, 33C, and son. Therollers: 39 are rotatable about transverse horizontal axes and havetheir lower peripheries positioned at approximately the level of thetops of the end walls of the carton. The; rollers of the series arespaced with. their outer edges progressively further outwardly from thecenter of the conveyor way so that each roller depresses the inner sidewall panel it further into: the carton. Note that the lower spacer panelll approaches the bottom panel 5 of the carton during this operation.After passing the series of rollers 3.9 the carton is advanced pastbevelled crimping: rolls 40 that are rotatable about downwardly andinwardly'inclined axes with the rollers disposed on the inner sides ofthe cartons and just above the level of the end walls. These rollersengage and crimp the inner side wall forming panels l5 against the upperspacer panels i2 and thus crimp or set the folds along the score lineI4.

After the cartons pass the bevelled crimping rolls 4!] they are advancedpast inwardly tapering rollers 41 illustrated in Fig. 10'. The rollers4| are rotatable about horizontal axes and are disposed with their lowerperiphery in the path of the upper spacer panels 52 to fold these panelsinwardly and bend the side wall forming flap along the score line I l Asecond set of inwardly tapered rolls 42 positioned behind the rolls 4'!and illustrated in Fig. 11 have a smaller degree of taper and furtherbend the top spacer panels [2 inwardly. During the downwardly foldingmotion of the top spacer panels I! the inner side wall panels I5 arepressed downwardly between the inner end walls 4 of the carton and thelooking tabs I9 are sprung into the notches 8 in the ends of the innerend walls. The bottom side spacer panels ll are carried against thebottom side edges of the carton where they form abut' ments or supportsto facilitate bending of the side wall forming flaps along the scorelines H, M and I6.

After the cartons have passed the rollers 4| and 42 they ar advancedunderneath rotating shoes 43 that are carried on arms 44 secured to thetransversely extending shaft G5. The shaft 45 extends transverselyacross; the conveyor way and, is driven in timed relationship Withtheconveyor chain 23 by a chain 46 to rotate the arms 44 against thedirection of movement of cartons and in timed. relation with theconveyor chain to present the shoes 43 to the now nearly horizontal topspacer panels l2. The lower surfaces of the shoes 43 at the lower limitof their travel are disposed in the plane ofthe upper surface of the endwalls of the carton and thus firmly press the side walls into fullyerected rectangular cross sectional position. This final downwardpressure on the upper side spacer panels I: forces the inner side wallsl5 downwardly sufliciently to permit the upper edges of the locking tabs19 to snap underneath the locking shoulders 9 in the inner end walls andthe erection of the carton is complete.

In order to make sure that the erected carton is square and firm it isadvanced past squaring rollers 41 after passing the shoes 43. Therollers 41 are outwardly tapered and disposed over the double side wallsof the carton to cammingly force th inner and outer side wall slightlyoutwardly against the side rails 28 to assure that the sides of thecarton are square. After passing the rollem 41 the cartons are deliveredfrom the end of the erecting machine.

A highly practical form of the invention has thus been described so thatothers may reproduce or use the same for the purpose intended. Quiteobviously various modifications and changes in detail and arrangement ofthe parts can be made without departing from the spirit of the inventionas defined in the following claims.

It will be understood that the terms side walls and end walls are usedin the specification and claims as a matter of convenience in desinating the parts particularly in relation to the elements coactingtherewith in erecting the carton, and that the carton might be of anydesired dimensions, that is, it might be elongated rather than square asis illustrated.

Having thus described our invention, what we claim to be new and desireto secure by Letters Patent, is:

l. A. machine for folding and erecting inner side walls on a partiallyerected carton having erected double end walls and outer side Walls withinner side wall forming flaps extending as continuations above saidouter side walls comprising, a conveyor having flights adapted toadvance the cartons in endwise fashion, side rails laterally retainingsaid outer side walls along said conveyor, bridge elements spacedlongitudinally along said conveyor and extending transversely thereover,a hold down rail supported by said bridge elements and extending beyondthe element at the infeed end of the conveyor to engage the tops of theend walls of said cartons, a support carried by said center rail at theinfeed end thereof in spaced relation above said end Walls and coactingwith said side rails to laterally support the inner sides of said sidewall flaps in upright position, pairs of rollers mounted on the infeedend bridge element for rotation about transversely spaced vertical axeson opposite sides of said side flaps, the rollers of said pairs beingvertically spaced to bend the upper ends of said sid 'fiaps inwardlyinto spacer flaps, the flaps being scored to facilitate such bending,side flap folding rollers mounted on inclined axes on. said side railsbehind said pairs of rollers and engageable with said side flaps to foldthe same inwardly over the sides of said support, said side foldingrollers being tapered inwardly, narrow extensions on the trailing end ofsaid support, bending rollers rotatable about transverse horizontal axesover said extensions to bend said side flaps thereover, a series oflongitudinally spaced rollers positioned behind said bending rollers androtatable about transverse horizontal axes with the outer ends of therollers in the series positioned progressively outwardly from the centerof th conveyor to progressively depress said side flaps, bevelledcrimping rollers positioned behind said series of rollers to crimp saidside flaps against said outer side walls, inwardly tapering rollersrotatable about transverse horizontal axes behind said crimping rollersand in the path of the crimped fold in said side flaps to fold thesubadjacent portions of the side flaps inwardly into top spacer walls,and shoes rotatable in longitudinal vertical planes over said side wallsand swingable in timed relationship with said conveyor in oppositelytraveling direction to the level of the tops of said outer walls to bendsaid top spacer walls to horizontal position, the inner side wallforming flaps being pressed against the bottom of the carton in spacedrelation to the outer side Walls by the top spacer walls.

2. A machine for folding and erecting inner side walls on a partiallyerected carton having erected double end walls and outer side walls withinner side wall forming flaps extending as continuations above saidouter side walls comprising, a conveyor having flights adapted toadvance the cartons in endwise fashion, side rails laterally retainingsaid outer side walls along said conveyor, bridge elements spacedlongitudinally along said conveyor and extending transversely thereover,a hold down rail supported by said bridge elements to engage the tops ofthe end walls of said cartons, a support carried by said center rail atthe infeed end thereof in spaced relation above said end walls andcoacting with said side rails to laterally support the inner sides ofsaid side wall flaps in upright position, pairs of rollers mounted onthe infeed end bridge element for rotation about transversely spacedvertical axes on opposite sides of said side flaps, the rollers of saidpairs being vertically spaced to bend the upper ends of said side flapsinwardly into spacer flaps, side flap folding rollers mounted oninclined axes behind said pairs of rollers and engageable with said sideflaps to fold the same inwardly over the sides of said support, narrowextensions on the trailing end of said support, bending rollersrotatable about transverse horizontal axes over said extensions to bendsaid side flaps thereover. a series of longitudinally spaced rollerspositioned behind said bending rollers and rotatable about transversehorizontal axes with the outer ends 01' the rollers in the seriespositioned progressively outwardly from the center of the convevor toprogressively depress said side flaps. bevelled crimping rollerspositioned behind said series of rollers to crimp said side flapsagainst said outer side walls, inwardly tapering rollers rotatable abouttransverse horizontal axes behind said crimping rollers and in the pathof the orimped fold in said side flaps to fold the sub-adjacent portionsof theside flaps inwardly into top spacer walls, and shoes rotatable inlongitudinal vertical planes over said side walls and swingable in timedrelationship with said conveyor to the level of the tops of said outerwalls to bend said top spacer walls to horizontal position, the innerside wall forming flaps being pressed against the bottom of the cartonin spaced relation to th outer side walls by the top spacer walls.

3. A machine for folding and erecting inner side walls on a partiallyerected carton having erected end walls and outer side walls with innerside wall forming flaps extending as continuations above said outer sidewalls comprising, a conveyor having flights adapted to advance thecartons in endwise fashion, side rails laterally retaining said outerside Walls along said conveyor, 2. hold down rail supportedlongitudinally over said conveyor to engage the tops of the end walls ofsaid cartons, a support carried by said center rail at the infeed endthereof in spaced relation above said end Walls and coacting with saidside rails to laterally support said side wall flaps, pairs of rollersmounted above the infeed end of said support for rotation abouttransversely spaced axes on opposite sides of said side flaps, therollers of said pairs being axially spaced and overlapping to bend theupper ends of said side flaps inwardly into spacer flaps, side flapfolding rollers mounted alongside said conveyor behind said pairs ofrollers and engageable with said side flaps to fold the same inwardlyover the sides of said support, narrow extensions on the trailing end ofsaid support, bending rollers rotatable about transverse axes over saidextensions to bend said side flaps thereover, a series of longitudinallyspaced rollers positioned behind said bending rollers and rotatableabout transverse axes with the outer ends of the rollers in the seriespositioned progressively outwardly from the center of the conveyor toprogressively depress said side flaps, bevelled crimping rollerspositioned behind said series of rollers to crimp said side flapsagainst said outer side walls, inwardly tapering rollers rotatable abouttransverse axes behind said crimping rollers and in the path of thecrimped fold in said side flaps to fold the subadjacent portions of theside flaps inwardly into top spacer walls, and shoes rotatable inlongitudinal planes over said side walls and swingable in timedrelationship with said conveyor to the level of the tops of said outerwalls to bend said top spacer walls to horizontal position.

4. A machine for folding and erecting inner side walls on a partiallyerected carton having erected end walls and outer side walls with innerside Wall forming flaps extending as continuations above said outer sidewalls comprising, a conveyor having flights adapted to advance thecartons in endwise fashion, side rails laterally retaining said outerside walls along said conveyor, a hold down rail supportedlongitudinally over said conveyor to engage the tops of the end walls ofsaid cartons, a support carried by said center rail at the infeed endthereof in spaced relation above said end walls and coasting with saidside rails to laterally support said side wall flaps, pairs of rollersmounted above the infeed end of said support for rotation abouttransversely spaced axes on opposite sides of said side flaps, therollers of said pairs being axially spaced and overlapping to bend theupper ends of said side flaps inwardly into spacer flaps, side flapfolding rollers mounted alongside said conveyor behind said pairs ofrollers and engageable with. said side flaps to fold the same inwardlyover the sides of said support, narrow extensions on the trailing end ofsaid support, bending rollers rotatable about transverse axes over saidextensions to bend said side flaps thereover, a series of longitudinallyspaced rollers positioned behind said bending rollers and rotatableabout transverse axes with the outer ends of the rollers in the seriespositioned progressively outwardly from the center of the conveyor toprogressively depress said side flaps, rollers rotatable behind saidseries of rollers and in the path of the upstanding portions of saidside flaps to fold the upstanding portions of the side flaps inwardlyinto top spacer walls, and shoes rotatable in longitudinal planes oversaid side walls and swingable in timed relationship with said conveyorto the level of the tops of said outer walls to bend said top spacerwalls to horizontal position.

5. A machine for folding and erecting inner side walls on a partiallyerected carton having erected end walls and outer side walls with innerside wall forming flaps extending as continuations above said outer sidewalls comprising, a conveyor having flights adapted to advance thecartons in endwise fashion, means laterally retaining said outer sidewalls along said conveyor, a support mounted over said conveyor at the.infeed end thereof in spaced relation above said end walls and acting tolaterally support the inner sides of said side wall flaps, pairs ofrollers mounted above said support for rotation about transverselyspaced axes on opposite sides of said side flaps, the rollers of saidpairs being axially spaced and overlapped to bend the upper ends of saidside flaps inwardly into spacer flaps, side flap folding means mountedbehind said pairs of rollers and engageable with said side flaps to foldthe same inwardly over the sides of said support, narrow extensions onthe trailing end of said support, means positioned over said extensionsand engageable with the outsides of the side flaps to bend said sideflaps over said extensions, a series of longitudinally spaced rollerspositioned behind said last means with the outer edges of the rollers inthe series positioned progressively outwardly from the center of theconveyor to progressively depress said side flaps and press the swingingend thereof between said end walls, crimping rollers positioned behindsaid series of rollers to crimp the inwardly folded portions of saidside flaps against the unfolded portions thereof, rollers positionedbehind said crimping rollers and in the path of th fold in said sideflaps to fold the sub-adjacent portions of the side flaps inwardly intotop spacer walls, and shoes rotatable over said side walls and swingablein timed relationship with said conveyor to the level of the tops ofsaid outer walls to bend said top spacer walls to horizontal position.

6. A machine for folding and erecting inner side walls on a partiallyerected carton having erected end walls and outer side walls with innerside wall forming flaps extending as continuations above said outer sidewalls comprising, a

conveyor having flights adapted to advance the cartons in endwisefashion, means laterally retaining said outer side walls along saidconveyor, a support mounted over said conveyor at the infeed end thereofin spaced relation above said end walls and acting to laterally supportthe inner sides of said side wall flaps, pairs of rollers mounted abovesaid support for rotation about transversely spaced axes on oppositesides of said side flaps, the rollers of said pairs being axially spacedand overlapped to bend the upper ends of said side flaps inwardly intospacer flaps, side flap folding means mounted behind said pairs ofrollers and engageable with said side flaps to fold the same inwardlyover the sides of said support, a. series of longitudinally spacedrollers positioned behind said last means with the outer edges of therollers in the series positioned progressively progressively depresssaid side flaps and press-the swinging end thereof between said endwalls, rollers positioned behind said series of rollers and in the pathof the fold in said side flaps to fold the sub-adjacent portions of theside flaps inwardly into top spacer walls, and shoes rotatable over saidside walls and swingable in timed relationship with said conveyor to thelevel of the tops of said outer walls to bend said top spacer walls tohorizontal position.

'7. A machine for folding and erecting inner side walls ona partiallyerected carton having erected end walls and outer side walls with innerside wall forming flaps extending as continuations above said outer sidewalls, comprising a conveyor having flights adapted to advance thecartons in endwise fashion, means laterally retaining said outer sidewalls along said conveyor, pairs of rollers mounted above the infeed endof said conveyor for rotation about transversely spaced axes on oppositesides of said side flaps, the rollers of said pairs being axially spacedand overlapped to bend the upper ends of said side flaps inwardly intospacer flaps, side flap folding means mounted behind said pairs ofrollers and engageable with said side flaps to fold the same inwardly, aseries of longitudinally spaced rollers positioned behind said side flapfolding means with the other edges of the rollers in the seriespositioned progressively outwardly from the center of the conveyor toprogressively depress said side flaps, crimping rollers positionedbehind said series of rollers to crimp the inwardly folded portions ofsaid side flaps against the unfolded portions thereof, means positionedbehind said crimping rollers and in the path of the crimped fold in saidside flaps to fold the sub-adjacent portions of the side flaps inwardlyinto top spacer walls, and shoes rotatable over said side walls andswingable in timed relationship with said conveyor in oppositelytraveling direction to the level of the tops of said outer walls to bendsaid top spacer walls to horizontal position, the inner side wallforming flaps being pressed against the bottom of the carton in spacedrelation to the outer side walls by the top spacer walls.

8. A machine for folding and erecting inner side walls on a partiallyerected carton having erected end walls and outer side walls with innerside wall forming flaps extending as continuations above said outer sidewalls, comprising, a conveyor having flights adapted to advance thecartons in endwise fashion, means laterally retaining said outer sidewalls along said conveyor, means mounted above the infeed end of saidconveyor on opposite sides of said side flaps, said last means beingoverlapped to bend the upper ends of said side flaps inwardly intospacer flaps, side flap folding means mounted behind said spacer flapfolding means and engageable with said side flaps to fold the sameinwardly, a series of longitudinally spaced rollers positioned behindsaid side flap folding means with the outer edges of the rollers in theseries positioned progressively outwardly from the center of theconveyor to progressively depress said side flaps, crimping meanspositioned behind said series of rollers to crimp the inwardly foldedportions of said side flaps against the unfolded portions thereof, meanspositioned behind said crimping means and in the path of the crimpedfold in said side flaps to fold the sub-adjacent portions-of the sideflaps inwardly into top spacer walls, and shoes rotatable over said sidewallsand swingable in timed relationship with said conveyor to the levelof the donatisaidouter walls. to bend. said top, spacer walls tohorizontal position, the inner side wall forming flaps being pressedagainst the bottom of the carton in spaced relation to the outer sidewalls by the top spacer walls.

9. A machine for folding a side flap extending at right angles from thebottom of a partially erected carton into spaced inner and outer sideWalls spacedby upper and lower spacer walls, the flap being scoredlongitudinally to divide the flap into said wall portions, comprising, aconveyor adapted to advance the carton with said flap in uprightlongitudinally extended position,

I first folding means positioned to engage the outer edge of said flapand bend the bottom spacer wall laterally from the plane of the otherwall portions of the flap, second folding means engageable with theoutside of said flap at the inner side wall portion thereof to fold saidside wall laterally from the plane of the outer wall and upper spacerwall portions extended, a fixed support engageable with the upper spacerwall portion in opposition to said second folding means, third foldingmeans engageable with the laterally folded inner side wall to depressthe same to an acute angle inwardly from the top spacer wall portionextended, fourth folding means engageable with the outside of the topspacer Wall portion to bend the same laterally inwardly from the top ofthe outer side wall, all said folding means comprising rollersrotatively engageable with the stated portions of said side flap withthe periphery of each roller extending tangentially to the plane of thefolded position of the flap portion, and mean including a shoe rotatablein timed relation to said conveyor and in the plane of said side wallextended to tangent to the top of said outer side Wall to depress saidtop spacer wall to horizontal position whereby the lower spacer wall andinner wall are swung downwardly and inwardly into erected engagementwith the outer side wall and bottom respectively of the carton.

10. A machine for folding a side flap extending at right angles from thebottom of a partially erected carton into spaced inner and outer sidewalls spaced by upper and lower spacer walls, the flap being scoredlongitudinally to' divide the flap into said wall portions, comprising,a conveyor adapted to advance the carton with said flap inlongitudinally extended position, first folding means positioned toengage the outer edge of said flap and bend the bottom spacer walllaterally from the plane of the other wall portions of the flap, secondfolding means engageable with the outside of said flap at the inner sidewall portion thereof to fold said side wall laterally from the plane ofthe outer wall and upper spacer wall portions extended, a fixed supportengageable with the upper spacer wall portion in opposition to saidsecond folding means, third folding means engageable with the laterallyfolded inner side wall to depress the same to an acute angle inwardlyfrom the top spacer wall portion extended, fourth folding meansengageable with the outside of the top spacer wall portion to bend thesame laterally inwardly from the top of the outer side wall, all saidfolding means comprising rollers rotatively engageable with the statedportions of said side fiap with the periphery of each roller extendingtangentially to the plane of the folded position of the flap portion,and means to depress said top spacer wall to horizontal position wherebythe lower spacer wall and inner wall are swung downwardly and in- 11wardly into erected engagement with the outer side wall and bottomrespectively of the carton.

11. A machine for folding a side flap extending at right angles from thebottom of a partially erected carton into spaced inner and outer sidewalls spaced by upper and lower spacer walls, the flap being scoredlongitudinally to divide the flap into said wall portions, comprising, aconveyor adapted to advance the carton with said flap in longitudinallyextended position, first folding means positioned to engage the outeredge of said flap and bend the bottom spacer wall laterally from theplane of the other wall portions of the flap, second folding meansengageable with the outside of said flap at the inner side wall portionthereof to fold said side wall laterally from the plane of the outerwall and upper spacer wall portions extended, a fixed support engageablewith the upper spacer wall portion in opposition to said second foldingmeans, third folding means engageable with the laterally folded innerside wall to depress the same to an acute angle inwardly from the topspacer wall portion extended, fourth folding means engageable with theoutside of the top spacer wall portion to bend the same laterallyinwardly from the top of the outer side wall, said third folding meanscomprising longitudinally spaced rollers rotatively engageable with theinner side wall portion of said side flap with the outer edges ofsuccessive rollers extending progressively outwardly and tangentially tothe plane of the folded position of the inner wall portion, and means todepress said top spacer wall to horizontal position whereby the lowerspacer wall and inner wall are swung downwardly and inwardly intoerected engagement with the outer side wall and bottom respectively ofthe carton.

12. A machine for folding partially erected cartons having erected andconnected side and end walls with a side flap extending from the sidewall into spaced inner and outer side walls between said end wallsspaced by upper and lower spacer walls, the flap being scoredlongitudinally to divide the flap into said wall portions, comprising, aconveyor adapted to advance the carton with said flap in uprightlongitudinally extended position, first folding means positioned toengage the outer edge of said flap and bend the bottom spacer walllaterally from the plane of the other wall portions of the flap, secondfolding means engageable with the outside of said flap at the inner sidewall portion thereof to fold said side wall laterally from the plane ofthe outer wall and upper spacer wall portions extended, a fixed supportengageable with the upper spacer wall portion in opposition to saidsecond folding means, third folding means engageable with the laterallyfolded inner side wall to depress the same between said end walls to anacute angle inwardly from the top spacer wall portion extended, fourthfolding means engageable with the outside of the top spacer wall portionto bend the same laterally inwardly from the top of the outer side wall,said third folding means comprising series of longitudinally spacedrollers rotatively engageable with said inner sidewall portion of saidside flap with the outer end of each successive roller extending furtheroutwardly of the conveyor, and means including a shoe rotatable in timedrelation to said conveyor and in the plane of said side wall extended totangent to the top of said outer side wall to depress said top spacerwall to horizontal position whereby the lower spacer wall and inner wallare swung 12 downwardly and inwardly into erected engagement with theouter side wall and bottom respectively of the carton.

13. A, machine for folding partially erected cartons having erected andconnected side and end walls with a side flap extending from the sidewall into spaced inner and outer side: walls between said end wallsspaced by upper and lower spacer walls, the flap being scoredlongitudinally to divide the flap into said wall portions, comprising, aconveyor adapted to advance the carton with said flap in uprightlongitudinally extended position, first folding means positioned toengage the outer edge of said flap and bend the bottom spacer walllaterally from the plane of the other wall portions of the flap, secondfolding means engageable with the outside of said 'flap at the innerside wall portion thereof to fold said side wall laterally from theplane of the outer wall and upper spacer wall portions extended, thirdfolding means engageable with the laterally folded inner side wall todepress the same between said end walls to an acute angle inwardly fromthe top spacer wall portion extended, fourth folding means engageablewith the outside of the top spacer wall portion to bend the samelaterally inwardly from the top of the outer side wall, said thirdfolding means comprising series of longitudinally spaced rollersrotatively engageable with said inner side wall portion of said sideflap with the outer end of each successive roller extending furtheroutwardly of the conveyor, and means positioned to depress said topspacer wall to horizontal position whereby the lower spacer wall andinner wall are swung downwardly and inwardly into erected engagementwith the outer side wall and bottom respectively of the carton.

14. A machine for folding partially erected cartons having erected sideand end walls with a side flap extending from the side wall into spacedinner and outer side walls between said end walls spaced by upper andlower spacer walls, the flap being scored longitudinally to divide theflap into said wall portions, comprising, a conveyor adapted to advancethe carton with said flap in upright longitudinally extended position,first folding means positioned to engage the outer edge of said flap andbend the bottom spacer wall laterally from the plane of the other wallportions of the flap, second folding means engageable with the outsideof said flap at the inner side wall portion thereof to fold said sidewall laterally from the plane of the outer wall and upper spacer wallportions extended, third folding means engageable with the laterallyfolded inner side wall to depress the same between said end walls to anacute angle inwardly from the top spacer wall portion extended,.fourthfolding means engageable with the outside of the top spacer wall portionto bend the same laterally inwardly from the top of the outer side wall,said third folding means comprising series of longitudinally spacedrollers rotatively engageable with said inner-side wall portion of saidside flap with the periphery of each roller extending tangentially tothe plane of the flap portions, in progressively deflected positions,and means positioned to depress said top spacer wall to horizontalposition whereby the lower spacer wall and inner wall are swungdownwardly and inwardly into erected engagement with the outer side walland bottom respectively of the carton.

15. A machine for folding and erecting inner side walls on a partiallyerected carton having erected end walls and outer side walls with inner13 side wall forming flaps extending as continuations above said outerside walls comprising, a conveyor having flights adapted to advance thecartons in endwise fashion, means laterally retaining said outer sidewalls along said conveyor, a support mounted over said conveyor "at theinfeed end thereof in spaced relation above said end walls and acting tolaterally support the inner sides of said side wall flaps, first foldingmeans mounted above said support and transversely engageable withopposite sides of said side flaps and overlapped to bend the upper endsof said side flaps inwardly into spacer flaps, side flap folding meansmounted behind said first folding means and engageable with said sideflaps to fold the same inwardly over the sides of said support, narrowextensions on the trailing end of said support, means positioned oversaid extensions and engageable with the outsides of the side flaps tobend said side flaps over said extensions, other means positioned behindsaid last means and engageable with the inwardly folded side flaps atpoints spaced longitudinally along the conveyor to progressively depresssaid side flaps and press the swinging ends thereof between said endwalls, crimping means positioned behind said other means to crimp theinwardly folded portions of said side flaps against the unfoldedportions thereof, top folding means positioned behind said other foldingmeans and in the path of the fold in said side flaps to fold thesubadjacent portions of the side flaps inwardly into top spacer walls,and shoes rotatable over said side walls and movable vertically in timedrelationship with said conveyor to the level of the tops of said outerwalls to bend said top spacer walls to horizontal position.

16. A machine for folding and erecting inner side walls on a partiallyerected carton having erected end walls and outer side walls with innerside wall forming flaps extending as continuations above said outer sidewalls comprising, a conveyor having flights adapted to advance thecartons in endwise fashion, means laterally retaining said outer sidewalls along said conveyor, a support mounted over said conveyor at theinfeed end thereof in spaced relation above said end walls and acting tolaterally support the inner sides of said side wall flaps, first foldingmeans mounted above said support and transversely engageable withopposite sides of said side flaps to bend the upper ends of said sideflaps inwardly into spacer flaps, side flap folding means mounted behindsaid first folding means and engageable with said side flaps to fold thesame inwardly over the'sides of said support, other means positionedbehind said last means and engageable with the inwardly folded sideflaps at points spaced longitudinally along the conveyor toprogressivelyv depress said side flaps and press the swinging endsthereof between said end walls, top folding means positioned behind saidother folding means and in the path of the fold in said side flaps tofold the sub-adjacent portions of the side flaps inwardly into topspacer walls, and means over said side walls and movable vertically intimed relationship with said conveyor to the level of the tops of saidouter walls to bend said top spacer walls to horizontal position.

JOHN D. BEHL.

No references cited.

